{"id":182645,"date":"2026-07-15T16:53:50","date_gmt":"2026-07-15T14:53:50","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/vypusk-svt-av1-4-2-0-kodirovshhika-dlya-formata-video-av1"},"modified":"2026-07-15T16:53:50","modified_gmt":"2026-07-15T14:53:50","slug":"vypusk-svt-av1-4-2-0-kodirovshhika-dlya-formata-video-av1","status":"publish","type":"post","link":"https:\/\/prohoster.info\/it\/blog\/novosti-interneta\/vypusk-svt-av1-4-2-0-kodirovshhika-dlya-formata-video-av1","title":{"rendered":"Uscita di SVT-AV1 4.2.0, encoder per il formato video AV1.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"<p>\u00c8 stata pubblicata la versione 4.2.0 della libreria SVT-AV1 (Scalable Video Technology AV1) con implementazioni dell'encoder e del decoder per il formato di codifica video AV1, accelerati grazie alle estensioni di parallelizzazione hardware presenti nei processori x86_64 e ARM. Il progetto \u00e8 stato creato da Intel in partnership con Netflix con l'obiettivo di raggiungere un livello di prestazioni adatto per la ricodifica video in tempo reale e per l'uso in servizi di video on demand (VOD). Attualmente lo sviluppo \u00e8 gestito sotto l'egida dell'alleanza Open Media (AOMedia), che supervisiona l'evoluzione del formato di codifica video AV1. In precedenza, il progetto era parte della iniziativa OpenVisualCloud, che sviluppa anche gli encoder SVT-HEVC e SVT-VP9. Il codice \u00e8 distribuito sotto licenza BSD.     <\/p>\n<p>SVT-AV1 pu\u00f2 essere compilato per sistemi basati su qualsiasi architettura per cui \u00e8 disponibile un compilatore che supporta lo standard C99, ma le migliori prestazioni si ottengono su sistemi x86_64, dove vengono applicate ottimizzazioni in assembly basate sulle istruzioni SIMD (\u00e8 preferibile avere il supporto AVX2 nella CPU, ma \u00e8 sufficiente anche SSE2 come minimo). Il consumo di memoria dipende dal numero di core CPU utilizzati per la codifica, regolabile tramite l'opzione &#171;&#8212;lp&#187;. A causa della complessit\u00e0 degli algoritmi utilizzati in AV1, la codifica in questo formato richiede significativamente pi\u00f9 risorse rispetto ad altri formati.     <\/p>\n<p>Tra le novit\u00e0 della nuova versione di SVT-AV1:  <\/p>\n<ul>\n<li class=\"l\"> \u00c8 stata implementata una nuova modalit\u00e0 di ottimizzazione TUNE-VMAF, che consente di risparmiare fino al 15% del bitrate mantenendo lo stesso livello di qualit\u00e0 visiva in conformit\u00e0 con la metrica VMAF, che valuta la percezione umana, con una lieve diminuzione della qualit\u00e0 secondo la metrica PSNR, che valuta l'accuratezza della riproduzione dei dati originali a livello di pixel.\n<li class=\"l\"> \u00c8 stata implementata una modalit\u00e0 di codifica a singolo thread, che pu\u00f2 essere utilizzata con la modalit\u00e0 di accesso casuale (Random Access).\n<li class=\"l\"> Nei preset M3-M5 \u00e8 stata ottimizzata la compromesso qualit\u00e0\/velocit\u00e0 nella codifica in modalit\u00e0 di accesso casuale.\n<li class=\"l\"> Aggiunte nuove opzioni per la riga di comando: &#8212;cqp, &#8212;enable-intrabc, &#8212;hbd-mds, &#8212;enable-kf-tf.\n<li class=\"l\"> Aggiunto il supporto per l'output in formato raw OBU oltre al formato IVF precedentemente supportato.\n<li class=\"l\"> Ottimizzato il compromesso qualit\u00e0\/velocit\u00e0 nella codifica in modalit\u00e0 &#171;&#8212;rtc&#187; (Comunicazioni in Tempo Reale), migliorando anche l'efficienza della compressione e riducendo il consumo di memoria nella codifica a basse risoluzioni. Aggiunti i parametri &#171;&#8212;max-intra-bitrate-pct&#187; e &#171;&#8212;max-inter-bitrate-pct&#187;.\n<li class=\"l\"> Aggiunto il supporto per la codifica in tempo reale con un bitrate costante \u2014 CBR (Constant Bitrate), implementato utilizzando il filtro di Kalman e supportando l'aggiornamento ciclico con sfocatura delle modifiche complesse su pi\u00f9 fotogrammi e ricodifica dei fotogrammi di qualit\u00e0 inferiore se non rientrano nel bitrate fissato.\n<li class=\"l\"> In modalit\u00e0 \u00abrtc\u00bb \u00e8 stata aggiunta la possibilit\u00e0 di modificare dinamicamente le impostazioni del bitrate e dei preset in tempo reale.\n<li class=\"l\"> Aggiunto l'API per la gestione dei fotogrammi di riferimento, che supporta LTR (Long-Term Reference) e una struttura a due livelli dei set di fotogrammi di riferimento (RPS, Reference Picture Set).\n<li class=\"l\"> Ristrutturata l'implementazione della codifica entropica, che garantisce la scrittura diretta nel buffer dei segmenti (tile-buffer), semplifica il codificatore aritmetico e implementa il taglio dei dati residui dopo la quantizzazione.\n<li class=\"l\"> Aggiunte nuove ottimizzazioni CDEF (Constrained Directional Enhancement Filter) per eliminare il fastidio di sfocature nelle aree di transizione di contrasto, MD (Mode Decision) e ME (Motion Estimation) per una rapida elaborazione di oggetti statici.\n<li class=\"l\"> Ottimizzata la rilevazione della presenza di immagini video con contenuti testuali per applicare metodi di codifica specifici per mantenere la chiarezza del testo.\n<li class=\"l\"> Aggiunta l'opzione di assemblaggio ENABLE_STACK_PROTECTOR per disattivare il flag \u00ab-fstack-protector\u00bb, che consente di ridurre i costi associati al controllo del buffer overflow.\n<li class=\"l\"> Aggiunte ottimizzazioni aggiuntive per l'architettura ARM e utilizzate istruzioni avanzate NEON per velocizzare i calcoli.      <\/ul>\n<p>Fonte: <a content=\"nofollow\" rel=\"nofollow\" href=\"https:\/\/www.opennet.ru\/opennews\/art.shtml?num=65903\">opennet.ru<\/a> <\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"<p>\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 SVT-AV1 4.2.0 (Scalable Video Technology AV1) c \u0440\u0435\u0430\u043b\u0438\u0437\u0430\u0446\u0438\u044f\u043c\u0438 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0430 \u0438 \u0434\u0435\u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0449\u0438\u043a\u0430 \u0444\u043e\u0440\u043c\u0430\u0442\u0430 \u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u0438\u0434\u0435\u043e AV1, \u0434\u043b\u044f \u0443\u0441\u043a\u043e\u0440\u0435\u043d\u0438\u044f \u043a\u043e\u0442\u043e\u0440\u044b\u0445 \u0437\u0430\u0434\u0435\u0439\u0441\u0442\u0432\u043e\u0432\u0430\u043d\u044b \u043f\u0440\u0438\u0441\u0443\u0442\u0441\u0442\u0432\u0443\u044e\u0449\u0438\u0435 \u0432 \u043f\u0440\u043e\u0446\u0435\u0441\u0441\u043e\u0440\u0430\u0445 x86_64 \u0438 ARM \u0440\u0430\u0441\u0448\u0438\u0440\u0435\u043d\u0438\u044f \u0434\u043b\u044f \u0430\u043f\u043f\u0430\u0440\u0430\u0442\u043d\u043e\u0433\u043e \u0440\u0430\u0441\u043f\u0430\u0440\u0430\u043b\u043b\u0435\u043b\u0438\u0432\u0430\u043d\u0438\u044f \u0432\u044b\u0447\u0438\u0441\u043b\u0435\u043d\u0438\u0439. \u041f\u0440\u043e\u0435\u043a\u0442 \u0441\u043e\u0437\u0434\u0430\u043d \u043a\u043e\u043c\u043f\u0430\u043d\u0438\u0435\u0439 Intel \u0432 \u043f\u0430\u0440\u0442\u043d\u0451\u0440\u0441\u0442\u0432\u0435 \u0441 Netflix \u0441 \u0446\u0435\u043b\u044c\u044e \u0434\u043e\u0441\u0442\u0438\u0436\u0435\u043d\u0438\u044f \u0443\u0440\u043e\u0432\u043d\u044f \u043f\u0440\u043e\u0438\u0437\u0432\u043e\u0434\u0438\u0442\u0435\u043b\u044c\u043d\u043e\u0441\u0442\u0438, \u043f\u0440\u0438\u0433\u043e\u0434\u043d\u043e\u0433\u043e \u0434\u043b\u044f \u043f\u0435\u0440\u0435\u043a\u043e\u0434\u0438\u0440\u043e\u0432\u0430\u043d\u0438\u044f \u0432\u0438\u0434\u0435\u043e \u043d\u0430 \u043b\u0435\u0442\u0443 \u0438 \u043f\u0440\u0438\u043c\u0435\u043d\u0435\u043d\u0438\u044f \u0432 [&hellip;]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":10,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-182645","post","type-post","status-publish","format-standard","hentry","category-novosti-interneta"],"aioseo_notices":[],"aioseo_head":"\n\t\t<!-- All in One SEO 5.0.0.1 - aioseo.com -->\n\t<meta name=\"description\" content=\"\u041e\u043f\u0443\u0431\u043b\u0438\u043a\u043e\u0432\u0430\u043d \u0432\u044b\u043f\u0443\u0441\u043a \u0431\u0438\u0431\u043b\u0438\u043e\u0442\u0435\u043a\u0438 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